chore: add gitignore, documentation, and LC3 conformance test software

- Add .gitignore for Python, virtual environments, testing artifacts, IDE files, and LC3 test outputs including SQAM audio files
- Add AGENTS.md with project context for LC3 implementation testing
- Add LC3.TS.p5.pdf test specification document
- Add LC3 conformance interoperability test software V1.0.8 with script readme and reference binary symlink

lc3_quali.code-workspace

@@ -0,0 +1,13 @@
+{
+	"folders": [
+		{
+			"path": "."
+		},
+		{
+			"path": "../bumble-auracast"
+		}
+	],
+	"settings": {
+		"python.languageServer": "None"
+	}
+}